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See Hoffman report page 71

• op_slope_score =op_height/op_depth
  

>5	+1
1.5-5	0.5
1-1.5	0
0.25-1	-0.5
<0.25	-1
NA	0

• op_rug_score
  

metal, béton -étanche et lisse	1
maconnerie	0.5
pierres	-0.5
other	-1

• ob_score=ob_rug_score+ob_slope_score+ob_height
  

si "bueno" --> passe à poisson --> 0

• op_score_expert

if "bueno" --> pass --> 0

• op_eel_cross

bueno, malo, regular